Multiple-series relay-controller.



No. 890,979. I PATENTED'JUNE 16, 1908. G. T. HENDERSON.

MULTIPLE SERIES RELAY CONTROLLER,

APPLIGATION FILED SEPT.6,1907.

+1) sTA'r-Es PATENT @FFIQE.

.cLAR TL HENDERSON, or MILWAUKEE, WISCONSIN, 'ASSIGNOR TO THECUTLER-HAMMER I MFG. 00., or MILWAUKEE, WISCONSIN, A CORPORATION orWISCONSIN.

I Massacre.

' MULTIPLE-seams nnnenconrnoanns.

Specification of Letters Patent.

Patented Tune 16, 1908.

Application filed september 6, 1907. Serial No. 351,593.

whom it may concern:

Be it known that I, CLARK T.IHENDIRSON,

-a' citizen of the United States, residing at "Milwaukeefin the countyof Milwaukee and reference being had to the accompanymg State ofWisconsin, have invented-new and useful'lmprovements in Multiple-SeriesRela fu 'Contr'ollers, of which the ollowing is a l,- clear, ;"concise,and exact description,

drawing-,iprminga part of this specification.

'Mylnvention relates to improvements, in

electric motor controllers, and it applies par- 'fticularlyto motorcontrollers in which the ,startin resistance is controlled'by a' lura tyofindependent switches.

means of he'objeet r myinvention is a provide certain im rovements. inmeans whereby swim (JUXTGIIU.

will arrestedlw de -there is an abnormal In accordah ce' with thepreferred form of tro'l thcstarting resistance. These switches are'provided with auxiliary switches by means of which'when one of saidresistance switches is closed, it'completes the'circuit of a v succeedinswitch. Accordingly the switches. 1

are close successively. 7 {The circuit of the operating winding "of'eachswitch is further controlled by means of an electro-magnet- ,icallyoperatedrelay switch, there being an motor armature. Accordingly if oneof the inde endent relay switch foreach operating win mg The operating,winding of each re-- lay switch is connected in circuit in seriesbetween its preceding. resistance switch and the switches closes, theoperating winding of the succeeding switch is connected in circuit, and

- if the current is abnormal, said relay switch will respond and preventthe next resistance switch from bein- 'closed., The operating winding ofeach re ay switch is so connected incircuit that when its correspondingrestance switch is closed it is short circuited, and

I provide a main switc 1 which is operatliereby rendered inoperativesolthat it cannot cause'said switch to open.

' In order to more particularly set forth the characteristic featuresofl my' invention, I- I shall describe the controller which isdiagrammatically illustrated the accompanylng drawings and exemplifiesmy invention as it may be embodied in ractice.

. es will respond-successively'and the pgogressiye oppration of- -saidswitches meansof electro-magnetic windings 6, 6 and 6 respectively. Theresistance switches 5 and 5 are provided with auxiliary contact 7 and 7a respectively. The resistance switches 55, 5 and 5 control'r'c'sistancesections 8, 8

and 8 respectively. The resistance switches I 5, 5 and 5* haveassociated therewith relay switches '9, Wand 9 respectively, which areoperated by electrc-magnetic windings 10,

i0 and 10*, respectively adapted to respond to a predetermined current.

The motor may be of any suitable type. I have illustrated a series woundmotor having an armature 11 and a field windiin 12. A

switch 13 may be placed in the line from which power is obtained.

I shall now describe theoperation of my controller. r

If the hand switch 3 be closed the winding '2 will be energized, andaccordingly the main switch 1 will be closed. The motor circuit is thuscompleted from the positive line through conductor 14, main switch 1,

conductor 15, relay winding 10, resistance.

8, 8 and 8 conductor 16, armature '11, field winding 12 and conductor 17to the negative line. Accordingly the motor is started with all thestarting resistance in circuit. WVindings 6, 6 and 6 are connected tothe negative line by means of conductor 18. hen the main switch 1 isclosed, windingfi is connected to the positive line through auxiliarycontact 4, and relay switch 9. Accordingly it will respond and closeresistance switch 5 which will short circuit resistance 8 and winding 10and connect relay winding 10 in circuit. Theresistance switch 5 will notbe closed ifthe current in the motor circuit be abnormal, as the circuitof-the-wmding 6 will be opened by the relay switch9, while the currentis abnormal, the relay switch 9 being opened by the relay winding 10which is connected in series withthe motor and, adapted to respond to apredetermined current. 'As,s0on as the motor current sub sides toanormal amount, the relay switch 9 will close and then the resistancewinding 6 will be energized and the resistance switch 5 will he closed.

its

If the current becomes abnormal after re? sistance section 8 is removedfrom circuit b resistance switch 5, the relay winding 10 respond andopen relay switch 9, ening the circuit of windin 6, As soon as t e current becomes norma the relay switch 9 will be closed and the'n winding"6will be connected to the positive line through relay switch 9*,auxiliary switch 7, resistance switch and main switch 11 When switch 5is closed relaywinding is connected in circuit in series with the motorarmature and resistance 8 ,-;.and the relay winding 10 isshort-circuited. If the current be abnormal relay winding 10 willrespond and open relay switch 9', thereby opening the circuit of winding6 and preventing resistance switch 5 from closing. .As soon as thecurrent becomes normal relay switch 9 will close and winding 6" will beconnected to the positive line. through relay switch 9*, auxiliarycontact 7 resistance switch 5, conductor 19, main switch 1. Switch 5will now be closed by winding 6? and short-circuit resistance section 8and relay winding 10 The motor circuit-will then ex end from the ositiveline through conduct 14,mainswitc 1,con ductor 19, switch 5, conductor20, conductor 16, armature 11, field winding 12, conductor 17 to thenegative line. The resistance switches thus operate sucessively toremove the starting resistance from circuit; step by step.

switch next in or er of operation, would be arrested by itsCOIIBSPOIldlIlgIGlfiY switch,

Inasmuch as each switch, when it is closed,

short-circuits its corresponding switch it is rendered independent 0 anysubsequent abnormal increase in current, and accordingly the switchesthat have been closed will not be opened, and the switch next in orderof operation will be prevented from closing,.in-

asmuch as the circuit to its corresponding recessively, a plurality ofresistance sections controlled by said switches, a. plurality ofelectromagnetically operated relay switches, one for each of saidresistance switches and each being connected in circuit to control thecircuit of the operating winding of its corre-- s pondingresistanceswitch, and electrical con-: nections whereby the o cratingwinding of each of saidrelayswitc es is connected in circuit in serieswith the motor armature If the-current becomes abnormal at any stage inthe rocess, the closure of the" each adapted to control the operatingwind-f ing 'of its corresponding resistance switch,

and electrical connections whereby the operating windin of'each relayswitch is connectt ed in ircuit in series with the motor armature theresistance switch that'precedes it in order of operation 'and isshort-circuited by its corresponding resistance switch.

3. In a motor controller, in combination, a plurality of resistanceswitches,a plurality of operating windin s one for each of saidswitches, a plura ity of resistance sections controlled bysaid switches,a lurality of.

electro-magnetically operated re ay switches one for each of saidresistance switches'and each connected 1n clrcuit to control the c1r'-'cuitv of the operating winding of its 'corresponding resistance switch,and electrical connectlons whereby the closin of each resistanceswitch'eloses the circuit-through the operating winding, of thenextfsucceeding resistance switch, connects the operating winding of thecorresponding: relay switc thereof, in-circuit in, series with the motorarmature,

and short-circuits; its own relay switch. I

4. .In a motor controller, in combination, a plurality of electroemasistance switches, a plurality of resistance sections controlled by saidswitches, a plurality of electro-magnetically operated relay switches,one for each of said resistance switches'and each adapted to control theoperating winding of its correspondin resistance switch, electricalconnections w ereby the operating winding of each of said rela switchesis connected in circuit in series wit 1 the motor armature by theresistance switch 'netically operated rethat precedes itin order ofoperation and is short-circuited by its corres onding resist anceswitch, and a mam swltc for closing the armature circuit adapted toclose the circult through the o erating winding of the relay switchcontrol ing the first resistance switch.

In witness whereof, I have hereunto sub-- scribed my name in thepresence of two w1t-,

nesses.

- CLARK 'l. HENDERSON.

Witnesses: I

FRANK Il. HUBnnRD, ALEXANDER H. Moonris-

